What culture code should I use for Pinyin?

Question

My Question

If you want to display Pinyin for Chinese-speaking users, in what "resource file" would you store the Pinyin translation?

Since Pinyin is NOT a "language" per se, but a Latin representation of Chinese characters, it does NOT have a culture code in .NET.

My guess is that we probably need to use the applicable "zh-" (Chinese) cultures and simply place the latin character Pinyin translation inside those resource files.

I apologize in advance if this is a stupid question, but all the different culture stuff is scrambling my brain!!

Background

We're finally getting around to Internationalization of our Web sites. We're handling most of the "Western" cultures okay now (Latin alphabet: "es", "fr", "de") and the different date/number formats. However, the ideogram-based writing systems like Chinese are a challenge due to various legacy systems not handling Unicode. As a short-term workaround, our business area decided to use Pinyin for Chinese speaking users.

So... the business area asked me to "just add a Pinyin resource file" to the site.